I'm going to regret asking, but I'm curious about which rule? Must be the UKA rule that forbids the use of any technical device (except heart rate monitors)? I guess a compass could be considered a technical device, but that would be daft.
(a similar UKA rule bans runners from not wearing at least a vest, but that rule doesn't get applied!)
Replies, if any, to this question must be answered bearing in mind that I have no intention of using any such technical device and will probably wear at least a vest, I'm just interested.